Ingrid Lunden:

The housing market is predicted to cool this year, but the market for startups selling houses? It seems to be heating up. Opendoor, the company that aims to bypass real estate agents and brokers by providing an online platform — by way of a mobile app — for people to buy and sell properties direct, has filed papers in Delaware indicating that it would like to raise around $200 million more, at a valuation of about $3.7 billion.

The Delaware documents (embedded below, and provided to us by Prime Unicorn Index) do not make it clear if this would come in the form of an outside round, or a conversion — secondary transactions would not be disclosed in public domain documents, or a combination of the two; nor is it clear if the funding has closed already. The documents are dated February 8th of this year.

The raise comes just one month after Knock, an Opendoor competitor, raised $400 million.